Just finished chipping my 14mm with a Canon EMF AF chip
I had to make a spacer to get the chip's contacts to the correct height, but after that installation and configuration was very easy.
Works like a charm! Very handy to have aperture and focal length data in EXIF. AF confirm and AF adjust also works, but because the DOF is so large there is quite a lot of margin. Live-view x10 works better
I find the focus ring a but spongy, there seems to be a bit of a dead area before it catches and changes focus, is that normal?
I also made a spacer, much in the same way. No complaints about my focus ring, it operates smoothly not spongy.
5Dmk3, 5Dmk2, Sony NEX-6 | SY14mm f/2.8, Ʃ20mm f/1.8, 35mm f/2, Ʃ35mm f/1.4A, 50mm f/1.8 I, Ʃ50mm f/1.4 EX, 100mm f/2.8L Macro, 17-40L, 24-105L, 70-200 f/2.8L IS II, 1.4x II, 70-300L, 100-400L | E-mount: 16-50 OSS, Ʃ30mm f/2.8 EX DN, 55-210 OSS | 2x FT-QL, AE-1 Program, some FD(n) & FL primes